Reference : The aerodynamic cost of head morphology in bats: maybe not as bad as it seems
Scientific journals : Article
Life sciences : Zoology
Engineering, computing & technology : Aerospace & aeronautics engineering
http://hdl.handle.net/2268/177592
The aerodynamic cost of head morphology in bats: maybe not as bad as it seems
English
Vanderelst, Dieter [Universiteit Antwerpen - UA > Department of Engineering Management > Active Perception Lab > >]
Peremans, Herbert [Universiteit Antwerpen - UA > Department of Engineering Management > Active Perception Lab > >]
Abdul Razak, Norizham [Université de Liège - ULiège > Aerospace and Mechanical Engineering Department > Fluid Structure Interaction and Experimental Aerodynamics > >]
Verstraelen, Edouard mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
Dimitriadis, Grigorios mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
2015
PLoS ONE
Public Library of Science
10
3
e0118545
Yes (verified by ORBi)
International
1932-6203
San Franscisco
CA
[en] Bats ; Ear aerodynamics ; Wind tunnel
[en] At first sight, echolocating bats face a difficult trade-off. As flying animals, they would benefit from a streamlined geometric shape to reduce aerodynamic drag and increase flight efficiency. However, as echolocating animals, their pinnae generate the acoustic cues necessary for navigation and foraging. Moreover, species emitting sound through their nostrils often feature elaborate noseleaves that help in focussing the emitted echolocation pulses. Both pinnae and noseleaves reduce the streamlined character of a bat’s morphology. It is generally assumed that by compromising the streamlined charactered of the geometry, the head morphology generates substantial drag, thereby reducing flight efficiency. In contrast, it has also been suggested that the pinnae of bats generate lift forces counteracting the detrimental effect of the increased drag. However, very little data exist on the aerodynamic properties of bat pinnae and noseleaves. In this work, the aerodynamic forces generated by the heads of seven species of bats, including noseleaved bats, are measured by testing detailed 3D models in a wind tunnel. Models of Myotis daubentonii, Macrophyllum macrophyllum, Micronycteris microtis, Eptesicus fuscus, Rhinolophus formosae, Rhinolophus rouxi and Phyllostomus discolor are tested. The results confirm that non-streamlined facial morphologies yield considerable drag forces but also generate substantial lift. The net effect is a slight increase in the lift-to-drag ratio. Therefore, there is no evidence of high aerodynamic costs associated with the morphology of bat heads
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen ; UE - Union Européenne
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/177592
10.1371/journal.pone.0118545
http://journals.plos.org/plosone/article?id=info:doi/10.1371/journal.pone.0118545

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